Ultralight, undying black holes could be scattered across the Universe

The most probable fate of primordial black holes is either complete evaporation in a runaway process, or the formation of Planck-scale relics.

A fresh model presented by astrophysicists raises the likelihood that the Cosmos could be filled with ultralight primordial black holes that don’t die.Formed during the earliest moments after the birth of the Universe, primordial black holes are theoretical objects. The destiny of ultralight black holes depends on whether or not evaporation halts at or around the Planck scale. If evaporation stops, the general prospect is that a population of Planck-scale relics will be left over, perhaps including a significant fraction of electrically charged relics.If evaporation does not halt, a runaway “explosion” would happen, with significant and potentially detectable high-energy emissions.

Astrophysicist Stefano Profumo reviewed both likelihoods, with a stress on current status and future detection prospects.According to the models, their formation resulted from micro-fluctuations in matter density and spacetimethat made them sand grain-sized mountain-massed black holes.Although astrophysicists have never ever detected primordial black holes, they have all the essential properties of dark matter, such as not emitting light and the capability to cluster around galaxies. If they in fact exist, they could explain most of dark matter, according to the paper published in Universe Today.

Ultralight primordial black holes may radiate away fully

In prior studies, most primordial black hole candidates have been ruled out. But the new model concentrates on ultralight primordial black holes.Profumoopined that there could be three likelihoods. The first will be that the ultralight black holes will radiate away totally and end as a short-lived flash of high-energy particles.In the second likelihood, a total evaporation could be prevented by any mechanism and the black hole will attain some kind of equilibrium state.In the third likelihood, the equilibrium state results in the disappearance of event horizon, leaving an exposed dense mass known as a naked singularity.

Objects might possess a net electric charge

According to Profumo, for the second and the third likelihood, the objects maypossess a net electric charge.The most probable fate of primordial black holes is either total evaporation in a runaway process, or the formation of Planck-scale relics.There exist more than a few arguments for the latter possibility, but the first is not at all excluded, as physics at the Planck scale is mostly unknown.

In the second and third possibilities, the equilibrium would be attained around the Planck scale and the leftovers would be proton sized but with much higher masses. But if these leftovers are electrically neutral, it won’t be possible to detect them.But, if the particles do have a charge, they will be certainly detectable by next generation of neutrino detectors.